Socket-switch for electric lamps.



6.].GUSTAFSON.

SOCKET SWITCH FOR ELECTRIC LAMPS. APPLICATION FlL ED nsc.:3. 1913.

Patent-ed Oct. 24, 1916.

CARL J CHAN GUSTAFSON, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR T0 HENDEE MANUFACTURING COMI ANY, OF SPRINGFIELD, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

SOCKET-SWITCH FOR ELECTRIC LAM PS.

T 0 all whom it may concern:

Be it known that I, CARL J. GUs'rAFsoN,

a subject of the King of Sweden, residing at Springfield, in the county of Hampden, State of Massachusetts, have invented certain new and useful Improvements in Socket- Switches for Electric Lamps, of which the following is a description, reference being had to the accompanying drawing and to the figures of reference marked thereon. My invention relates to improvements in socket switches for electric lamps, and while I have particularly designed it for use in connection with electric head and.tail.-lights for 1notorcycl'es,,it will be understood that it is not restricted to such use.

It relates to that class having a plug for carrying the terminal or terminals, and the object is to provide a construction in which the plug when released from position where it establishes contact to cause the lightingof the lamp, may still be prevented from accidental displacement, and yet may be entirely disconnected if desired.

The invention, therefore, consists of a cylindrical casing containing spring-operated contact plungers. adapted when forced toward each other by the lamp at one end and the plug at the other end, to establish the circuit and light the lamp, and having as a connection between the casing and plug for supporting the latter, a cap inwardly flanged to prevent the withdrawal of the plug even when in nonoperative position, except by turning it to position where the flange is cut away to allow withdrawal.

The invention further consists in the matters hereinafter described and referred to in the appended claims.

The invention is illustrated in the accompanying drawings, in which,

Figure 1 is a side elevation, partly in section, showing my invention applied to the tail light of a motorcycle; Fig. 2 is a side elevation of the switch socket, the cap being shown in section; Fig. 25 is a detail view of the terminal plug; Fig. 4 is an end view of the cap; Fig. 5 is an end view of the casing;

Fig. 6 is a sectional view of Fig. 1, the

frame portions being omitted.

In these drawings, 1 represents the tail lamp cas1ng,2 the lens, 3 a portion of the Specification of Letters Patent.

frame through which the return of the current passes, 4 the plug, 5 the wire, and 6 the electric lamp.

7 is a'metallic cylindrical casing, screwthreaded as at 8 to sorew'into the lamp casng 1. It has diametrically opposite bayonet joint slots 9 for engaging the projecting pins 10 on the lamp base. Similar slots 11 at the other end of the casing engage or interlock with projections 12 on the plug 4-.

13 is an insulating body fastened within the casing, and having a bore to receive a metal cylinder 14 having a pair of contact plungers 15 pressed outwardly by a spring Then the lamp 6 is inserted in the cylinder 7, and the projecting pins 10 are turned into the position shown in Fig. 1, the plunger 15 is forced in and electric contact can be made and the lamp lighted when the projections 12 on the plug 4 are forced into the position shown in Fig. 2.

In order to prevent accidental displacement or removal of the plug 4 from the easing 7 when the projections 12 are in the longitudinal portion of the slots 11, I have provided'a cap 17 which is sprung over the casing 7, and has an inwardly extending flange 18 cut away at diametrically opposite points 19 to allow the passage of the projections 12 on the plug'4c beyond the flange.

The cut away portionsor grooves 19 of the flange are out of line with the slots 11, so that when the projections on the plug are released from the transverse portions of said slots 11 and the plug is moved outwardly,

the projections 12 will engage the flange 18, and thus be prevented from jarring loose, and can only be removed by turning until the projections 12 register with the grooves 19. By this arrangement, therefore, to cut off the light it is only necessary to turn the plug until the spring can operate to force it outwardly, but it cannot be disconnected entirely without manually pulling the projections 12 out of the longitudinal portion of the slots 11 and turning until they register with grooves 19.

Having thus described my invention, What I claim is: I

1. A socket switch including a casing having slots at one end to interlock With proe'ctions on the terminal plug, and a cap fitting over said casing covering said slots Patented Uct. 241, 1916.

Application filed December 13, 1913. Serial No. 806,480.

I and surrpunding the plug and having a stop to permitthe withdrawal of the plug when 13 flange to prevent the withdrawal of the plug. turned to a determined position.

'2. A socket switch comprising a casing In testimony whereof, I do aflix my own having the bayonet-slots therein atpne end, signature and in the presence of two wit- 5 the plug terminal having projectionsto in: nesses.

terlock. in said slots, and a cap cfirried by CARL J OHAN GUSTAFSON.

said casing and surrounding the plug and Witnesses: having an internal stop flange for said pro- JOHN D... STEPHENS, jec-tions, and cut away portions on said flange JOHN CRONIN.

(wpleii of this patent may be obtained for the cents each, by addressing the Commissioner of Patents,

Washington, I). 0. 

